31
9 Specifications
Instrument specifications 9.1
Note (
1
): UART (3.3 V logic) is available only for the standard type (ARO-FT).
Sensor specifications 9.2
Note (
2
): Calculated from air saturation at 25 °C and 34 PSU.
Note (
3
): Temperature calibration range: 3 ‒ 30 °C
Note (
4
): Accelerated degradation test.
Note (
5
): Pressure hysteresis is not considered.
Note (
6
): Typical value for immersing from air-saturated water with 25 °C to sodium sulfite solution.
Power 6 ‒ 26 VDC (12 VDC recommended)
Current drain (at 12 VDC) Operation mode: < 30 mA, Sleep mode: < 0.1 mA
Communication (
1
)
UART (3.3 V logic), voltage range: 3.3V ±5% (3.135 ‒ 3.465 V)
RS-232C
Communication protocol Baud rate: 38400 bps, No parity, Handshake
AD converter 16 bit digital conversion
Sampling interval 1 s
Pre-heat time 5 s
Model name
ARO-FT AROD-FT
Depth rating 2,000 m depth equivalent 6,700 m depth equivalent
Material
Housing: Titanium (grade 2)
Insulation screw: POM
Housing: Titanium (Ti-6Al-4V)
Connector 8-pin LEMO Impulse MCBH-8-MP
Weight
In air: approx. 183 g (main unit)
In water: approx. 110 g (main unit)
In air: approx. 265 g
In water: approx. 175 g
Parameter
Temperature DO
Principle Thermistor Phosphorescence
Measurement range -3 ‒ 45 °C
Oxygen concentration: 0 ‒ 425 µmol L
-1
(
2
)
Air saturation: 0 ‒ 200%
Calibration range 0 ‒ 35 °C
Oxygen concentration: 0 ‒ 255 µmol L
-1
(
2
)
Air saturation: 0 ‒ 120%
Resolution 0.001 °C 0.01 µmol L
-1
Accuracy ±0.01 °C
Initial accuracy: ± 2% of measured value or ±2.0 µmol L
-1
(
3
)
Sample-based drift: < ±5% of measured value or ±5.0 µmol L
-1
/ 4,000,000 samples (
4
)
Pressure effect: < ±2% of measured value or ±2.0 µmol L
-1
(
5
)
Temperature effect: < ±2% of measured value or ±2.0 µmol L
-1
Response time (63%) < 1 s in water < 1 s in water (
6
)
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